/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(Client, Reliable) void ClientActivateAbilityFailed ( [FGameplayAbilitySpecHandle](API\Plugins\GameplayAbilities\FGameplayAbilitySpecHandle) AbilityToActivate, int16 PredictionKey )